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At 19 years old while she was a sophomore in college, Sloane was raped after attending the homecoming dance by Rick Martel who she had asked to drive her home as she had been drinking. She subsequently left school and 6 weeks later found out that she was pregnant. She gave birth to a daughter, Faith Tolliver, whom she gave up for adoption and then joined the army to get her life back on track. She was a Forensic Psychologist in California.
She was also the sole survivor of a group of POWs captured in Afghanistan in 2007. She was tortured by a man she called The Monster, who she believed to be killed in a drone strike. This man is later revealed to be alive and using the name Nigel Hakim, posing as a British humanitarian.

Sloane is introduced in "Skeleton Crew (NCIS episode)", where she appeared at Gibbs's door in the middle of the night, during Hurricane Molly. She wanted to use his phone as her car broke down and her cell was dead.

Sloane's history as a POW is revealed in "Handle with Care," when she is faced with a victim who shares her experiences.

During season 16, Sloane and Gibbs grow closer and their chemistry increases, to the point where they both know things about one another that nobody else knows.

It is also revealed in this season that Sloane has a daughter, Faith Tolliver, who works as a doctor in a navy hospital. Sloane gave her up for adoption the day she was born, and Faith makes it clear that she doesn't want to get to know Sloane when they meet for the first time on a case.

Jack has a very caring and open personality, as she is always dedicated to helping others. She is always open to conversation, per her profession. She keeps many things private but tells her co-workers many things about herself. One thing is that she gave birth to a daughter, Faith Tolliver, and that Faith doesn't want to get to know her.